Global Simulation of Reactive Species Generation in Atmospheric Argon/Oxygen Plasma with Pulsed Power Source.
- Title
- Global Simulation of Reactive Species Generation in Atmospheric Argon/Oxygen Plasma with Pulsed Power Source.
- Authors
- JEONG, SEOK YONG; NAM, WOOJIN; YUN, GUNSU; LEE, JAE KOO
- Date Issued
- 2018-04-26
- Publisher
- 한국물리학회
- Abstract
- The boundary of high-temperature plasma confined by a toroidal magnetic field structure (a.k.a. tokamak)
often shows quasi-periodic relaxation oscillations between high and low energy states [1]. On the KSTAR
tokamak, the relaxation oscillation consists of a quasi-steady state characterized by field-aligned filamentary
eigenmodes, an abrupt phase transition into non-modal filamentary structure [2], and its rapid burst leading
to a large loss of heat and particle. We propose a phenomenological yet very general model including the
effects of time-varying perpendicular flow shear, turbulent transport, and pressure profile. Our model shows
that the amplitude and shear of the flow across the plasma boundary are the key parameters determining the
nonlinear oscillation. Numerical solutions for a range of the flow amplitude and shear indicate that a steadystate
exists only for weak flow. This result suggest that (1) the abrupt transition from the quasi-steady
eigenmode to the non-modal state is due to an increase of the flow, and (2) the suppression of filament burst
by external magnetic perturbations [3] may be due to the reduction of the flow.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94060
- Article Type
- Conference
- Citation
- KPS Spring Meeting 2018, 2018-04-26
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